Process for preparing melamine
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United States of America Patent
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Mar 21, 2017
Grant Date -
Sep 2, 2010
app pub date -
Oct 14, 2008
filing date -
Oct 15, 2007
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Abstract
Process for preparing melamine by converting urea in the presence of a solid catalyst in one reactor or in a plurality of reactors connected in series in the temperature range from 370° C. to 430° C., cooling and filtering the gas formed in the urea conversion, removing the melamine by desublimation and recycling a portion of the gas present after the melamine removal (“cycle gas”) into the reactor or the reactors, which comprises performing all of the above stages at a pressure in the range from 4 bar abs. to 10 bar abs.
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